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From: "Shi, Yang" <yang.shi@linaro.org>
To: aryabinin@virtuozzo.com
Cc: "linux-kernel@vger.kernel.org >> LKML" <linux-kernel@vger.kernel.org>
Subject: KASAN can't change FRAME_WARN
Date: Tue, 19 Apr 2016 10:48:06 -0700	[thread overview]
Message-ID: <57166F56.8010401@linaro.org> (raw)

Hi Andrey,

When I enable KASAN for 4.5 and 4.6 (I didn't try with older versions), 
I got FRAME_WARN warning for frame size exceeds 2048 bytes.

Then I found the kconfig looks like:

range 0 8192
default 0 if KASAN
default 1024 if !64BIT
default 2048 if 64BIT

In my understanding, FRAME_WARN should be 0 once KASAN is enabled, but 
it is still 2048. I tried a couple of fixes, i.e.

default 0 if KASAN
default 1024 if (!KASAN && !64BIT)
default 2048 if (!KASAN && 64BIT)

But, nothing works, so I have to add "depends on !KASAN" to disable 
FRAME_WARN completely, but it causes the kernel image size increased.

Any hint is appreciated.

Thanks,
Yang

             reply	other threads:[~2016-04-19 17:48 UTC|newest]

Thread overview: 2+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-04-19 17:48 Shi, Yang [this message]
2016-04-20 16:03 ` KASAN can't change FRAME_WARN Andrey Ryabinin

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